题目内容
双子叶植物的叶上下两个面形态、结构有明显的差别，被称为( )叶，禾本科植物叶没有腹背之分，被称为( )叶。
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When he arrived at the village，he found__________ the aged and the sick at home．
双子叶植物根的次生生长过程中，次生分生组织之一的木栓形成层一般产生于中柱鞘细胞。( )
根据以下内容回答题： Too often young people get themselves employed quite by accident，not knowing what lies in the way of opportunity for promotion，happiness and security．As a result，they are employed doing jobs that afford them little or no satisfaction．Our school leavers face so much competition that they seldom care what they do as long as they can earn a livin9．Some stay long at a job and learn to like it；others quit from one to another looking for something to suit them．The young graduates who leave the university look for jobs that．offer a salary up to their expectation．Very few go out into the world knowing exactly what they want and realizing their own abilities．The reason behind all this confusion is that there never has been a proper vocational guidance in our educational institution．Nearly all grope（摸索）in the dark and their chief concern when they look for a job is to ask what salary is like．They never bother to think whether they are suited for the iob or，even more important，whether the job suits them．Having a job is more than merely providing yourseff and your dependants with daily bread and．some money for leisure and entertainment．It sets a pattern of life and，in many ways，determines social status in life，selection of friends，leisure and interest． In choosing a career you should first consider the type of work which will you"re your interest．Nothing is more pathetic than taking on a job in which you have no interest，for it will not only discourage your desire to succeed in life but also ruin your talents and ultimately make you an emotional wreck and a bitter person．
The reason why some people are unlikely to succeed in life is that they__________ ．
双子叶植物茎进行次生生长时，维管形成层的射线状细胞向内进行分裂形成( )，向外细胞分裂形成( )。
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